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Click on the title links to order the book at Amazon.com in the U.S.A.
or click on (Amazon.de) to order the book at Amazon.de in Europe
or click on (Amazon.fr) to order the book at Amazon.fr in France.
(Eventhough Amazon.de does not yet carry all US books available at Amazon.com, I always added the corresponding link to Amazon.de for the case that they will become available later.)
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Mathematical Recreation

A Gathering of Gardner, by Martin Gardner, Freeman, 1987. (Amazon.de) - (Amazon.fr).
This is a collection of the following three books, also available separately (with descriptions of the books' cover):
Knotted doughnuts and other mathematical entertainments, by Martin Gardner, Freeman, 1986. (Amazon.de) - (Amazon.fr). From coincidences that seem to violate the laws of probaility, to the mysterious sequences of hexagrams in the I Ching, to the controversial and uproarious pseudoscientific economics of the Laffer curve.
Penrose tiles to trapdoor ciphers ... and the return of Dr. Matrix, by Martin Gardner, Freeman, 1986. (Amazon.de) - (Amazon.fr).
Gardner introduces us to Conway's Surreal Numbers, Mandelbrot's Fractals, and Smullyan's Logic Puzzles.

Time travel and other mathematical bewilderments, by Martin Gardner, Freeman, 1987. (Amazon.de) - (Amazon.fr). From coincidences that seem to violate the laws of time and space, to the perplexities of the rubber rope, to the centuries-old delights of tangram play, the puzzles, problems, and paradoxes presented in Time travel and other mathematical bewilderments reveal just how enlightening and entertaining mathematical recreations can be.

The Armchair Universe - An exploration of computer worlds, by A.K. Dewdney, 1998. 330 pages. (Amazon.de) - (Amazon.fr).
Quote from the cover note: Expert programmers and computer-shy neophytes alike will enjoy these games and problems drawn from the Computer Recreations column of Scientific American magazin. With Dewdney's lucid programming directions to follow, you can actually sit at your computer and try your hand at them all.

The Turing Omnibus - 61 excursions in computer science, by A.K. Dewdney, 1989, 415 pages. (Amazon.de) - (Amazon.fr).
Quote from the cover note: Prepare yourself for a wonderfully electric journey through the land of Turing, that ripe mathematical landscape fed by imagination and technology. From artificial intelligence and simulation to computer vision and cryptography, and how computers generate and manipulate random numbers, to simulate real life situations.
Whether your interest is casual or professional, The Turing Omnibus gives you a portable reference you'll read and refer to for years to come.